Small changes in the flux of the soil carbon reservoir have the potential to affect climate change.  The current effects of temperature on soil organic carbon are debated.  One mechanism by which carbon is stored in soil is by the formation of organo-mineral associations.  Organo-mineral associations have been shown to protect organic matter from decomposition for timescales of centuries to millennia.  This study examines the changes in the extent and kinetics of organo-mineral formation caused by relevant soil temperatures (25�C, 30�C, 35�C).  We use aluminum and iron oxides as representative mineral substrates and Elliott soil humic acid as representative soil organic matter.  Preliminary results have shown 1) significantly faster adsorption occurs at higher temperatures for iron oxide 2) iron oxide adsorbs organic matter faster than aluminum oxide at higher temperatures and 3) adsorption of SOM follows Langmuir kinetics.

Examining changes in adsorption/desorption dynamics of soil organic matter on aluminum and iron oxide substrates:  The effects of temperature

247th National Meeting (2014)

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